Research On Capability Evaluation And Structure Optimization For Off-road Vehicle Floor Protection

As the changes of the future conflict, the threat to off-road vehicles o\in the battlefield has also changed. The blast wave of landmines and improvised explosive devices (IED) onto the bottom of vehicle are one of the major threats to the off-road vehicle mission. Bottom protection research has great significance to improve the battlefield survivability of off-road vehicles and to increase the effective protection for vehicle crew. It has been one of the main research directions in off-road vehicle field.Evaluating of vehicle bottom protection capability, modeling and simulating of blast wave field, simulation modeling of explosion-vehicle-crew, simulation and test research of vehicle bottom protective capability,and optimization design of vehicle bottom protective structure are the key technologies which are the foundation of research and development of bottom protection for off-road vehicles. Research on these technologies can be practically and academically significant. This paper based on an off-road vehicle, using data analyzing, theoretical analysis, finite element method and blast test method to integrate research of key technologies for vehicle bottom protection The main work and creative results are as follows:(1) Systematical summaries to the research of the vehicle bottom protection technology,the protection ability analysis and structure optimization based on the digital simulation, the evaluation of the vehicle bottom protective capability, the protection strategy and its application, the main vehicle bottom protection technofogies, measures and protective capability data are systematically summar:ized in this paper; it proposes the emphases of off-road vehicles bottom protection technology and performance various requirements and technological suggestions for various vehicles vehicle bottom protection.(2) According to the characteristics of damage to the vehicle and its crew caused by the blast wave beneath the vehicle, referencing to relevant requirements of off-road vehicle survivability and crew protection and other relevant technical standards at home and abroad, based on the survivability of vehicle on the battlefield and the crew protection, this paper proposes the evaluation indicator system of the bottom protective capability. Some relevant indicator requirements are also researched. At the same time,the test method of vehicle bottom protection capability evaluation was studied. The mine test substitute, the data parameter and the equipment used in the paper are standardized. It can be used to evaluate the protective capability in IED test.(3) According to the requirements of simulation model of the blast impact field, the response of the cab structure parts and the analysis of the crew injury, based on the multi-material element and fluid-solid coupling algorithm, a simulation model with explosive-vehicle-crew full-element of explosive at the bottom of the vehicle was established; based on the model,it researches the response of vehicle bottom structure and crew. Several blast tests are conducted with different mine substitute to achieve the overpressure peak of each measure point, damage to the vehicle and response of hybridⅢ dummy and the protective capability of this vehicle have been summarized. By comparing the simulation with test results, it has been found that two results are highly matched, and vehicle bottwm protection capability can be predicted.(4) The effect of different material thickness and material characteristic parameters or under different mine substitutes is analyzed on the protective capability of homogeneous armor structures with Therefore,the sensitive area and sensitive parameters of the protective capability of the model are obtained. The topological structure and material parameters of V-shaped bottom structure, sandwich energy absorbing structure and crew restraint system are analyzed and obtain the functional relationship between design variables of the bottom structure and crew restraint system and target response is obtained.With the purpose of vehicle safety and crew safety, the bottom protective structure of vehicle is optimized by multi-parameter optimization method, and the protective capability is improved effectively.